20004545 has 8 divisors (see below), whose sum is σ = 26187840. Its totient is φ = 14548720.

The previous prime is 20004541. The next prime is 20004559. The reversal of 20004545 is 54540002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20004545 - 2² = 20004541 is a prime.

20004545 is a modest number, since divided by 4545 gives 2000 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20004541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181805 + ... + 181914.

It is an arithmetic number, because the mean of its divisors is an integer number (3273480).

Almost surely, 2^20004545 is an apocalyptic number.

It is an amenable number.

20004545 is a deficient number, since it is larger than the sum of its proper divisors (6183295).

20004545 is a wasteful number, since it uses less digits than its factorization.

20004545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363735.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20004545 is about 4472.6440725817. The cubic root of 20004545 is about 271.4623218156.

Adding to 20004545 its reverse (54540002), we get a palindrome (74544547).

The spelling of 20004545 in words is "twenty million, four thousand, five hundred forty-five".